Eutrophication and oxygen depletion in natural wasters can be very damaging to stream ecosystems. Which of the following is the primary cause of oxygen depletion in streams?
A. excessive carbon dioxide
B. iron oxide runoff
C. acid mine drainage
D. acid rain
E. excessive nutrients
Answer: E
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A. 1964 B. 1969 C. 1974 D. 1978 E. 1984
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A) Australia B) Germany C) Japan D) United States E) none of the above
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